How to manage one-many mapping in dynamodb?

@addison 

One-to-many mapping in DynamoDB can be managed by using a composite key or global secondary indexes. Here are some strategies to manage one-to-many relationships in DynamoDB:

1. Composite Key: Use a composite key to represent the one-to-many relationship. For example, you can create a primary key with a partition key that represents the "one" side of the relationship and a sort key that represents the "many" side of the relationship. This allows you to query items by the partition key and filter the results by the sort key.
2. Global Secondary Indexes (GSI): Create a GSI on the attribute that represents the "many" side of the relationship. This allows you to query items based on the "many" side of the relationship without scanning the entire table. The GSI can contain attributes that are part of the primary key, allowing you to efficiently retrieve related items.
3. Denormalization: Store related items within the same item or in a separate table. This can help reduce the number of queries needed to retrieve related items and can improve performance. However, denormalization can lead to data redundancy and may require additional maintenance to keep data in sync.
4. Query and Scan Operations: Use DynamoDB query and scan operations to retrieve related items based on certain criteria. This may be less efficient than using composite keys or GSIs, but can be useful in certain scenarios where other strategies are not feasible.

Overall, the best approach for managing one-to-many relationships in DynamoDB will depend on the specific use case and access patterns of your application. Experimenting with different strategies and monitoring performance can help determine the most effective approach for your data model.